3 wheel stroller vs. 4 wheel

Hi ladies
What's your experience with 3 wheel strollers vs. 4 wheel? What is the difference in performance, if any?
I am looking at getting a stroller for my baby due in August, as opposed to a travel system. The specific brand I'm looking at that I've seen on the Babies r us website is the Kiddu. Either the Cruz, which is a 4-wheel, or the Skylar which is a 3-wheel. The skylar looks slightly fancier than the Cruz and is only R100 more expensive. I was just wondering if there is any big difference between 3-wheelers and 4-wheelers. Also if anyone has specific experience with this particular brand, what is it like? I haven't actually been to the shop to look at it, I've only seen it on the website. I'll go soon and test them out at the shop as well. Thanks in advance for any advice.